This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A049302 #24 Feb 02 2025 01:56:51 %S A049302 6,10,17,25,36,42,50,59,60,61,72,73,78,79,81,84,86,87,89,92,93,95,96, %T A049302 160,200,212,222,225,227,239,260,261,269,290,291,296,300,301,304,311, %U A049302 313,315,324,326,327,330,336,344,345,348,350,355,362,372,378,379,381 %N A049302 Numbers k such that k is a substring of 4^k. %H A049302 Robert Israel, <a href="/A049302/b049302.txt">Table of n, a(n) for n = 1..10000</a> %Y A049302 Cf. A000302, A032740, A049301, A049303, A049304, A049305, A049306, A049307. %Y A049302 Includes A288845. %K A049302 nonn,base,easy %O A049302 1,1 %A A049302 _David W. Wilson_